// Memory scaling with dimensions:
// memory (bytes) ~= 2.25 * w + 0.0625 * w * h
//
// Typical memory footprint (768x510 picture)
// Memory used:
// encoder: 33919
// block cache: 2880
// info: 3072
// preds: 24897
// top samples: 1623
// non-zero: 196
// lf-stats: 2048
// total: 68635
// Transcient object sizes:
// VP8EncIterator: 352
// VP8ModeScore: 912
// VP8SegmentInfo: 532
// VP8Proba: 31032
// LFStats: 2048
// Picture size (yuv): 589824
static VP8Encoder* InitEncoder(WebPConfig* config,
WebPPicture* picture)
{
int use_filter =
(config.filter_strength > 0) || (config.autofilter > 0);
int mb_w = (picture.width + 15) >> 4;
int mb_h = (picture.height + 15) >> 4;
int preds_w = 4 * mb_w + 1;
int preds_h = 4 * mb_h + 1;
uint preds_size = preds_w * preds_h * sizeof(byte);
int top_stride = mb_w * 16;
uint nz_size = (mb_w + 1) * sizeof(uint);
uint cache_size = (3 * YUV_SIZE + PRED_SIZE) * sizeof(byte);
uint info_size = mb_w * mb_h * sizeof(VP8MBInfo);
uint samples_size = (2 * top_stride + // top-luma/u/v
16 + 16 + 16 + 8 + 1 + // left y/u/v
2 * ALIGN_CST) // align all
* sizeof(byte);
uint lf_stats_size =
config.autofilter ? sizeof(LFStats) + ALIGN_CST : 0;
VP8Encoder* enc;
byte* mem;
uint size = sizeof(VP8Encoder) + ALIGN_CST // main struct
+ cache_size // working caches
+ info_size // modes info
+ preds_size // prediction modes
+ samples_size // top/left samples
+ nz_size // coeff context bits
+ lf_stats_size; // autofilter stats
#if PRINT_MEMORY_INFO
printf("===================================\n");
printf("Memory used:\n"
" encoder: %ld\n"
" block cache: %ld\n"
" info: %ld\n"
" preds: %ld\n"
" top samples: %ld\n"
" non-zero: %ld\n"
" lf-stats: %ld\n"
" total: %ld\n",
sizeof(VP8Encoder) + ALIGN_CST, cache_size, info_size,
preds_size, samples_size, nz_size, lf_stats_size, size);
printf("Transcient object sizes:\n"
" VP8EncIterator: %ld\n"
" VP8ModeScore: %ld\n"
" VP8SegmentInfo: %ld\n"
" VP8Proba: %ld\n"
" LFStats: %ld\n",
sizeof(VP8EncIterator), sizeof(VP8ModeScore),
sizeof(VP8SegmentInfo), sizeof(VP8Proba),
sizeof(LFStats));
printf("Picture size (yuv): %ld\n",
mb_w * mb_h * 384 * sizeof(byte));
printf("===================================\n");
#endif
mem = (byte*)malloc(size);
if (mem == null) {
WebPEncodingSetError(picture, VP8_ENC_ERROR_OUT_OF_MEMORY);
return null;
}
enc = (VP8Encoder*)mem;
mem = (byte*)DO_ALIGN(mem + sizeof(*enc));
memset(enc, 0, sizeof(*enc));
enc.num_parts_ = 1 << config.partitions;
enc.mb_w_ = mb_w;
enc.mb_h_ = mb_h;
enc.preds_w_ = preds_w;
enc.yuv_in_ = (byte*)mem;
mem += YUV_SIZE;
enc.yuv_out_ = (byte*)mem;
mem += YUV_SIZE;
enc.yuv_out2_ = (byte*)mem;
mem += YUV_SIZE;
enc.yuv_p_ = (byte*)mem;
mem += PRED_SIZE;
enc.mb_info_ = (VP8MBInfo*)mem;
mem += info_size;
enc.preds_ = ((byte*)mem) + 1 + enc.preds_w_;
mem += preds_w * preds_h * sizeof(byte);
enc.nz_ = 1 + (uint*)mem;
mem += nz_size;
enc.lf_stats_ = lf_stats_size ? (LFStats*)DO_ALIGN(mem) : null;
mem += lf_stats_size;
// top samples (all 16-aligned)
mem = (byte*)DO_ALIGN(mem);
enc.y_top_ = (byte*)mem;
enc.uv_top_ = enc.y_top_ + top_stride;
mem += 2 * top_stride;
mem = (byte*)DO_ALIGN(mem + 1);
enc.y_left_ = (byte*)mem;
mem += 16 + 16;
enc.u_left_ = (byte*)mem;
mem += 16;
enc.v_left_ = (byte*)mem;
mem += 8;
enc.config_ = config;
enc.profile_ = use_filter ? ((config.filter_type == 1) ? 0 : 1) : 2;
enc.pic_ = picture;
enc.percent_ = 0;
MapConfigToTools(enc);
VP8EncDspInit();
VP8DefaultProbas(enc);
ResetSegmentHeader(enc);
ResetFilterHeader(enc);
ResetBoundaryPredictions(enc);
VP8EncInitAlpha(enc);
#if WEBP_EXPERIMENTAL_FEATURES
VP8EncInitLayer(enc);
#endif
return enc;
}
//------------------------------------------------------------------------------
int WebPEncode(WebPConfig* config, WebPPicture* pic)
{
VP8Encoder* enc;
int ok;
if (pic == null)
return 0;
WebPEncodingSetError(pic, VP8_ENC_OK); // all ok so far
if (config == null) // bad params
return WebPEncodingSetError(pic, VP8_ENC_ERROR_NULL_PARAMETER);
if (!WebPValidateConfig(config))
return WebPEncodingSetError(pic, VP8_ENC_ERROR_INVALID_CONFIGURATION);
if (pic.width <= 0 || pic.height <= 0)
return WebPEncodingSetError(pic, VP8_ENC_ERROR_BAD_DIMENSION);
if (pic.y == null || pic.u == null || pic.v == null)
return WebPEncodingSetError(pic, VP8_ENC_ERROR_NULL_PARAMETER);
if (pic.width > WEBP_MAX_DIMENSION || pic.height > WEBP_MAX_DIMENSION)
return WebPEncodingSetError(pic, VP8_ENC_ERROR_BAD_DIMENSION);
enc = InitEncoder(config, pic);
if (enc == null) return 0; // pic.error is already set.
// Note: each of the tasks below account for 20% in the progress report.
ok = VP8EncAnalyze(enc)
&& VP8StatLoop(enc)
&& VP8EncLoop(enc)
&& VP8EncFinishAlpha(enc)
#if WEBP_EXPERIMENTAL_FEATURES
&& VP8EncFinishLayer(enc)
#endif
&& VP8EncWrite(enc);
StoreStats(enc);
if (!ok) {
VP8EncFreeBitWriters(enc);
}
DeleteEncoder(enc);
return ok;
}